issen 一千 ni sen 二千 One thousand. The Arabic numerals are more often used in horizontal writing, and the Chinese numerals are more common in vertical writing. Definition of ichi, meaning of ichi in Japanese: 4 definitions matched, 149 related definitions, and 2 example sentences; hyaku man 百万 One million. jyuu 十 Ten; hyaku 百 One hundred. Two thousand. And the second word that is used is ban 番 which means “number in a series.” 一番 (ichiban) therefore means “number one” and is often used to indicate how things rank in position against each other. ichi man 一万 ni man 二万 Ten thousand. For convenience, a list of number magnitudes in Japanese. jyuu man 十万 Hundred thousand. Twenty thousand. There are two ways of writing the numbers in Japanese: in Arabic numerals (1, 2, 3) or in Chinese numerals (一, 二, 三). sen man 千万 Ten million. ichi 一 One. The first word is ichi 一 which means the number “one” in Japanese.